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The is a hydroelectric power station located in Kunigami, Okinawa, Japan and operated by the Electric Power Development Company. It is the world’s first pumped-storage to use seawater for storing energy.〔 Its maximum output is 30 MW.〔 == Facility == The power station is a pure pumped-storage, using the Philippine Sea as its lower reservoir, with effective drop of 136 m and maximum flow of 26 m³/s.〔 Its pipelines and pump turbine are installed underground.〔 Its maximum output is approximately 2.1% of the maximum power demand in the Okinawa Island recorded on August 3, 2009.〔 The upper reservoir, artificially excavated, lies approximately away from the shoreline and approximately above sea level.〔 It has an octagonal planar shape with its maximum width of .〔 Its maximum depth is and its effective storage capacity is .〔 The entire inner surface of the reservoir is covered with an impermeable liner to prevent seawater from leaking and damaging the surrounding vegetation.〔 Fiber-reinforced plastic tubes instead of steel tubes were adopted for the penstock and the tailrace in order to avoid seawater corrosion and adhesion of barnacles.〔 The pump turbine is partially made of stainless steel resistant to seawater.〔〔 A 66 kV line connects the power station with the power grid of The Okinawa Electric Power Company.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Okinawa Yanbaru Seawater Pumped Storage Power Station」の詳細全文を読む スポンサード リンク
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